CVE-2026-107726

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (30th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hazelcast is a unified real-time data platform combining stream processing with a fast data store. Prior to 5.4.5, 5.5.10, and 5.6.1, improper validation of data supplied by a malicious client able to connect to a cluster allows arbitrary reads from a cluster member's Java heap, off-heap data, and JVM process address space. The same flaw can crash cluster members and, in some Hazelcast Enterprise Edition configurations, corrupt memory with possible arbitrary code execution. Both slim and full distributions are affected. This issue is fixed in versions 5.4.5, 5.5.10, 5.6.1, and 5.7.0.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 8, 2026

Last Modified

October 9, 2026

Advisory Details (5)

Auto-updated Oct 8, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v5.7.0

Patch available: hazelcast/hazelcast v5.7.0

https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0
generic

Enterprise Edition Release Notes | Hazelcast Documentation

https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise
generic

Community Edition Release Notes | Hazelcast Documentation

https://docs.hazelcast.com/hazelcast/5.7/release-notes/community
github_commit

commit 361979da12f1 (hazelcast/hazelcast)

Fix landed in hazelcast/hazelcast commit 361979da12f1 — awaiting tagged release

https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f
githubMentions a patch (unverified)

Arbitrary member memory access by low-privileged client · Advisory · hazelcast/hazelcast · GitHub

https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j

Vendor Advisories for CVE-2026-107726(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 21:14 UTCEG score recompute
  2. 2026-10-09 20:06 UTCEPSS rescore
  3. 2026-10-09 16:34 UTCEG score recompute
  4. 2026-10-09 15:26 UTCEG score recompute
  5. 2026-10-08 22:21 UTCEG score recompute
  6. 2026-10-08 22:13 UTCEG score recompute
  7. 2026-10-08 22:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-107726?
CVE-2026-107726 is a critical vulnerability published on October 8, 2026. Hazelcast is a unified real-time data platform combining stream processing with a fast data store. Prior to 5.4.5, 5.5.10, and 5.6.1, improper validation of data supplied by a malicious client able to connect to a cluster allows arbitrary reads from a cluster member's Java heap, off-heap data, and…
When was CVE-2026-107726 disclosed?
CVE-2026-107726 was first published on October 8, 2026, with the most recent update on October 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-107726 actively exploited?
CVE-2026-107726 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107726?
CVE-2026-107726 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107726?
A fix for CVE-2026-107726 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107726 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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